@ledgerhq/hw-app-eth/lib-es/utils.js

Ledger Hardware Wallet Ethereum Application API

import { encode, decode } from "@ethersproject/rlp";
import { BigNumber } from "bignumber.js";
export function splitPath(path) {
    const result = [];
    const components = path.split("/");
    components.forEach(element => {
        let number = parseInt(element, 10);
        if (isNaN(number)) {
            return; // FIXME shouldn't it throws instead?
        }
        if (element.length > 1 && element[element.length - 1] === "'") {
            number += 0x80000000;
        }
        result.push(number);
    });
    return result;
}
export function hexBuffer(str) {
    return Buffer.from(str.startsWith("0x") ? str.slice(2) : str, "hex");
}
export function maybeHexBuffer(str) {
    if (!str)
        return null;
    return hexBuffer(str);
}
export const decodeTxInfo = (rawTx) => {
    const VALID_TYPES = [1, 2];
    const txType = VALID_TYPES.includes(rawTx[0]) ? rawTx[0] : null;
    const rlpData = txType === null ? rawTx : rawTx.slice(1);
    const rlpTx = decode(rlpData).map(hex => Buffer.from(hex.slice(2), "hex"));
    let chainIdTruncated = 0;
    const rlpDecoded = decode(rlpData);
    let decodedTx;
    if (txType === 2) {
        // EIP1559
        decodedTx = {
            data: rlpDecoded[7],
            to: rlpDecoded[5],
            chainId: rlpTx[0],
        };
    }
    else if (txType === 1) {
        // EIP2930
        decodedTx = {
            data: rlpDecoded[6],
            to: rlpDecoded[4],
            chainId: rlpTx[0],
        };
    }
    else {
        // Legacy tx
        decodedTx = {
            data: rlpDecoded[5],
            to: rlpDecoded[3],
            // Default to 1 for non EIP 155 txs
            chainId: rlpTx.length > 6 ? rlpTx[6] : Buffer.from("0x01", "hex"),
        };
    }
    const chainIdSrc = decodedTx.chainId;
    let chainId = new BigNumber(0);
    if (chainIdSrc) {
        // Using BigNumber because chainID could be any uint256.
        chainId = new BigNumber(chainIdSrc.toString("hex"), 16);
        const chainIdTruncatedBuf = Buffer.alloc(4);
        if (chainIdSrc.length > 4) {
            chainIdSrc.copy(chainIdTruncatedBuf);
        }
        else {
            chainIdSrc.copy(chainIdTruncatedBuf, 4 - chainIdSrc.length);
        }
        chainIdTruncated = chainIdTruncatedBuf.readUInt32BE(0);
    }
    let vrsOffset = 0;
    if (txType === null && rlpTx.length > 6) {
        const rlpVrs = Buffer.from(encode(rlpTx.slice(-3)).slice(2), "hex");
        vrsOffset = rawTx.length - (rlpVrs.length - 1);
        // First byte > 0xf7 means the length of the list length doesn't fit in a single byte.
        if (rlpVrs[0] > 0xf7) {
            // Increment vrsOffset to account for that extra byte.
            vrsOffset++;
            // Compute size of the list length.
            const sizeOfListLen = rlpVrs[0] - 0xf7;
            // Increase rlpOffset by the size of the list length.
            vrsOffset += sizeOfListLen - 1;
        }
    }
    return {
        decodedTx,
        txType,
        chainId,
        chainIdTruncated,
        vrsOffset,
    };
};
/**
 * @ignore for the README
 *
 * Helper to convert an integer as a hexadecimal string with the right amount of digits
 * to respect the number of bytes given as parameter
 *
 * @param int Integer
 * @param bytes Number of bytes it should be represented as (1 byte = 2 caraters)
 * @returns The given integer as an hexa string padded with the right number of 0
 */
export const intAsHexBytes = (int, bytes) => int.toString(16).padStart(2 * bytes, "0");
/**
 * @ignore for the README
 *
 * List of selectors (hexadecimal representation of the used method's signature) related to
 * ERC20 (Tokens), ERC721/ERC1155 (NFT).
 * You can verify and/or get more info about them on http://4byte.directory
 */
export var ERC20_CLEAR_SIGNED_SELECTORS;
(function (ERC20_CLEAR_SIGNED_SELECTORS) {
    ERC20_CLEAR_SIGNED_SELECTORS["APPROVE"] = "0x095ea7b3";
    ERC20_CLEAR_SIGNED_SELECTORS["TRANSFER"] = "0xa9059cbb";
})(ERC20_CLEAR_SIGNED_SELECTORS || (ERC20_CLEAR_SIGNED_SELECTORS = {}));
export var ERC721_CLEAR_SIGNED_SELECTORS;
(function (ERC721_CLEAR_SIGNED_SELECTORS) {
    ERC721_CLEAR_SIGNED_SELECTORS["APPROVE"] = "0x095ea7b3";
    ERC721_CLEAR_SIGNED_SELECTORS["SET_APPROVAL_FOR_ALL"] = "0xa22cb465";
    ERC721_CLEAR_SIGNED_SELECTORS["TRANSFER_FROM"] = "0x23b872dd";
    ERC721_CLEAR_SIGNED_SELECTORS["SAFE_TRANSFER_FROM"] = "0x42842e0e";
    ERC721_CLEAR_SIGNED_SELECTORS["SAFE_TRANSFER_FROM_WITH_DATA"] = "0xb88d4fde";
})(ERC721_CLEAR_SIGNED_SELECTORS || (ERC721_CLEAR_SIGNED_SELECTORS = {}));
export var ERC1155_CLEAR_SIGNED_SELECTORS;
(function (ERC1155_CLEAR_SIGNED_SELECTORS) {
    ERC1155_CLEAR_SIGNED_SELECTORS["SET_APPROVAL_FOR_ALL"] = "0xa22cb465";
    ERC1155_CLEAR_SIGNED_SELECTORS["SAFE_TRANSFER_FROM"] = "0xf242432a";
    ERC1155_CLEAR_SIGNED_SELECTORS["SAFE_BATCH_TRANSFER_FROM"] = "0x2eb2c2d6";
})(ERC1155_CLEAR_SIGNED_SELECTORS || (ERC1155_CLEAR_SIGNED_SELECTORS = {}));
export const tokenSelectors = Object.values(ERC20_CLEAR_SIGNED_SELECTORS);
export const nftSelectors = [
    ...Object.values(ERC721_CLEAR_SIGNED_SELECTORS),
    ...Object.values(ERC1155_CLEAR_SIGNED_SELECTORS),
];
export const mergeResolutions = (resolutionsArray) => {
    const mergedResolutions = {
        nfts: [],
        erc20Tokens: [],
        externalPlugin: [],
        plugin: [],
        domains: [],
    };
    for (const resolutions of resolutionsArray) {
        for (const key in resolutions) {
            mergedResolutions[key].push(...resolutions[key]);
        }
    }
    return mergedResolutions;
};
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